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1.14 b/s/Hz spectrally efficient 50×85.4-Gb/s transmission over 300 km using copolarized RZ-DQPSK signals

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2 Author(s)
Yoshikane, N. ; KDDI R&D Labs., Saitama, Japan ; Morita, I.

1.14 b/s/Hz spectrally efficient 50×85.4-Gb/s copolarized return-to-zero differential quaternary phase-shift keying (RZ-DQPSK) signals have been transmitted over 300 km of nonzero dispersion-shifted fiber (NZ-DSF), using optical prefiltering and conventional C-band erbium-doped fiber amplifier (EDFA) repeaters. In this study, in order to enhance the spectral efficiency, the impact of optical prefiltering on the RZ-DQPSK signal was experimentally investigated in comparison to the DQPSK signal, and we found that the RZ-DQPSK signal had better sensitivity with almost the same nonlinear tolerance than the DQPSK signal even with 65-GHz bandwidth optical prefiltering.

Published in:

Lightwave Technology, Journal of  (Volume:23 ,  Issue: 1 )

Date of Publication:

Jan. 2005

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